Armin Ronacher ⇌(@mitsuhiko):I had some vibes that Opus 4.8 was performing worse than older ones for some of uses that are off distribution and now I have the receipts. Latest Opus/Sonnet are causing tool invocation failures on Pi's edit tool when older ones did not! I wrote about it.

Armin Ronacher ⇌

@mitsuhiko

Creator of Flask. Building at Bypassing Permissions. Can hand crank. Husband and father of 3 — “more nuanced in person”

Joined February 2008

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Armin Ronacher ⇌@mitsuhiko

2026.07.04 19:25

I had some vibes that Opus 4.8 was performing worse than older ones for some of uses that are off distribution and now I have the receipts. Latest Opus/Sonnet are causing tool invocation failures on Pi's edit tool when older ones did not! I wrote about it.